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_________to nuclear radiation, even for ...

_________to nuclear radiation, even for a short time, may produce variants of genes in human bodies.

A. Being close    B. Having been closed

C. Closed    D. After being closed

 

A 【解析】考查非谓语动词。句意:靠近核辐射,甚至在很短的时间,可能在人体内产生基因变异。分析句子结构,空格处是作主语,故要用动名词形式,故选A。  
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